EP0667734A1 - Electronic reactor for the supply of discharge lamps with an oscillator circuit to limit the crest factor and to correct the power factor - Google Patents

Electronic reactor for the supply of discharge lamps with an oscillator circuit to limit the crest factor and to correct the power factor Download PDF

Info

Publication number
EP0667734A1
EP0667734A1 EP94830048A EP94830048A EP0667734A1 EP 0667734 A1 EP0667734 A1 EP 0667734A1 EP 94830048 A EP94830048 A EP 94830048A EP 94830048 A EP94830048 A EP 94830048A EP 0667734 A1 EP0667734 A1 EP 0667734A1
Authority
EP
European Patent Office
Prior art keywords
bridge
circuit
lamp
current
resonant circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP94830048A
Other languages
German (de)
French (fr)
Other versions
EP0667734B1 (en
Inventor
Antonio Canova
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Magnetek SpA
Original Assignee
Magnetek SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8218375&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0667734(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Magnetek SpA filed Critical Magnetek SpA
Priority to DE69410775T priority Critical patent/DE69410775T2/en
Priority to ES94830048T priority patent/ES2118355T3/en
Priority to AT94830048T priority patent/ATE167019T1/en
Priority to EP94830048A priority patent/EP0667734B1/en
Priority to US08/386,810 priority patent/US5485060A/en
Priority to CA002142250A priority patent/CA2142250A1/en
Publication of EP0667734A1 publication Critical patent/EP0667734A1/en
Publication of EP0667734B1 publication Critical patent/EP0667734B1/en
Application granted granted Critical
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4241—Arrangements for improving power factor of AC input using a resonant converter
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/425—Arrangements for improving power factor of AC input using a single converter stage both for correction of AC input power factor and generation of a high frequency AC output voltage
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/538—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a push-pull configuration
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Definitions

  • the invention relates to an electronic reactor or ballast for one or more discharge lamps of the type indicated in the introductory part of Claim 1.
  • the electronic reactor generally has an input section consisting of a low-pass filter and a diode bridge, which has the function of rectifying the alternating mains voltage to supply it to a power oscillator in which the direct voltage is transformed into high-frequency alternating voltage and is then transferred to the resonant circuit comprising the lamp.
  • the supply voltage across the terminals of the load circuit is a square-wave voltage at a high frequency, typically of the order of 25-30 kHz. It is supplied to a load circuit which typically has at least one discharge lamp with a capacitor in parallel and a stabilizing inductance in series.
  • a capacitor is also provided, in series with the load circuit, enabling the power factor to be corrected.
  • the amplitude of the current and voltage across the lamp terminals fluctuate at low frequency, typically at twice the mains frequency. This phenomenon is known as "ripple". The extent of this fluctuation is characterized by what is known as a crest factor. The fluctuation of the maximum value of the current amplitude in the lamp is extremely harmful, since it curtails the mean service life of the lamp.
  • the object of the present invention is to propose an improvement to the common electrical reactor which enables the ripple phenomenon to be reduced drastically, if not completely eliminated.
  • the invention provides an auxiliary series resonant circuit connected between the output of the lamp supply half-bridge and the bridge rectifier.
  • This auxiliary resonant circuit stores and returns power with each switching cycle of the switch means of the load circuit supply half-bridge. The oscillation of the maximum current intensity in the load circuit is therefore reduced, and consequently the crest factor is reduced.
  • the auxiliary series resonant circuit is a circuit of the LC type, with one inductance and one capacitor, and is connected between the output of the half-bridge and the positive pole of the rectifier.
  • the inductance of the auxiliary resonant circuit and the inductance of the load circuit may be wound on a common ferromagnetic core advantageously consisting (in a preferred embodiment) of a three- column core with two air gaps on the two outer columns on which the two windings are made.
  • the auxiliary resonant circuit also simultaneously corrects the power factor.
  • the auxiliary resonant circuit it is possible to obtain, for the same value of the smoothing capacitor, a much smaller crest factor than in conventional reactors.
  • the circuit has a filter 1, at whose input there is an alternating voltage supplied from a source indicated schematically by 3.
  • the filter output is connected to a diode bridge rectifier indicated by 5.
  • Two lines 7 and 9, positive and negative respectively, are connected to the positive pole 5A and the negative pole 5B of the bridge rectifier 5.
  • the direct voltage supplied by the bridge rectifier 5 is transformed to alternating voltage at high frequency by two switches 11 and 13, suitably controlled by an electronic control circuit 15, of a type known in itself and not described in greater detail.
  • the load supply voltage is obtained by alternate switching of the two switches 11 and 13.
  • the load circuit is connected between the output 19 of the half-bridge formed by the switches 11 and 13 and the negative line 9, but could also be connected between the said output 19 and the positive line 7.
  • the load circuit comprises a discharge lamp L in parallel with a capacitor 21.
  • An inductance 23, consisting of a stabilizing coil, and a capacitor 20 are connected in series with the lamp L and the capacitor 21.
  • the load circuit could also comprise two or more lamps with corresponding capacitors and inductances, in series and in parallel respectively.
  • Two diodes 25 and 27 are connected in parallel with the two switches 11 and 13 respectively of the supply half-bridge of the load circuit.
  • a smoothing capacitor 29 is also connected in parallel with the half-bridge between the negative line 9 and the positive line 7 down-line from a diode 31.
  • An auxiliary series resonant circuit indicated in a general way by 33 and comprising an inductance 35 and a capacitor 37 is connected between the output 19 of the half-bridge formed by the switches 11 and 13 and the positive pole 5A of the bridge rectifier 5.
  • the four phases of each switching cycle of the circuit described above will now be described with reference to Figs. 2 to 5 and 6A to 6D.
  • the load current variation shown in Figs. 6A - 6D is intended to relate to a cycle which is repeated with a frequency of 25-30 kHz, while the input voltage of the bridge 5 varies sinusoidally at the mains frequency (50 Hz).
  • the switch 13 In the first phase (illustrated in Figs. 2, 2A and 2B), the switch 13 is closed, while the switch 11 is open.
  • the current i c in the auxiliary resonant circuit flows in the direction shown in Fig. 2 from the positive pole 5A of the bridge rectifier through the resonant circuit 33, the switch 13 and the line 9 to the negative pole 5B of the bridge rectifier 5. Since the circuit 33 is a resonant circuit, the current i c (t) on the load varies as shown in Fig. 6A.
  • Figs. 2A and 2B show the equivalent circuits of the load current i c and the current i L in the resonant circuit. As shown in Fig. 2B, the load is across the line.
  • the switch 13 Before the current i c (t) is inverted, the switch 13 is opened and the circuit is in the state shown in Fig. 3, with both switches 11 and 13 open.
  • the current i L is passed through the diode 25 across the capacitor 29, to which the load current i c is also passed.
  • the smoothing capacitor 29 In this phase the smoothing capacitor 29 is charged and the current i c reaches zero as shown in the graph in Fig. 6B.
  • the smoothing capacitor is represented by a source of direct voltage.
  • the switch 11 Before the current i c reaches zero, the switch 11 is closed, while the switch 13 remains open. The circuit enters the state shown in Fig. 4. In this phase, the residual power stored in the auxiliary resonant circuit 33 is exchanged between the reactive components 35 and 37 of the resonant circuit 33, producing the current i L which flows as shown in Fig. 4. The power previously stored in the smoothing capacitor 29 is also returned to the load in this phase, producing a current i c indicatedin Fig. 4, as shown in the equivalent circuit in Fig. 4B, in which the capacitor 29 is again represented by a direct voltage source. The variation of the current i c is shown in Fig. 6C.
  • the switch 11 is then opened again and the circuit enters the state shown in Fig. 5, in which the current i L flows through the diode 27 and charges the capacitor 29.
  • the current i c varies as shown in Fig. 6D.
  • the current again reaches zero, and when this value is reached the switch 13 is closed again to return the circuit to the initial state shown in Fig. 2.
  • the power stored in the auxiliary resonant circuit 33 can be used (in the phase shown in fig. 5 with the switches 11 and 13 open) to reduce the crest factor and to bring the fluctuation of the load current to a minimum value.
  • auxiliary resonant circuit results in a reduction of the crest factor in the current i c , as seen in Fig. 8, where the graph of the current i c as a function of time is shown.
  • the letters (a) and (b) indicate the envelopes of the maxima and minima of the waveforms representing the high-frequency current across the load 17.
  • the undulation of the curves a and b is greatly reduced by comparison with the conventional circuits in which the auxiliary series resonant circuit 33 is not provided.
  • Fig. 9 shows the variation of the current i L where (c) and (d) are the envelopes of the maxima and minima.
  • the graph showing the variation of the current is drawn in an approximate form, since it should show a frequency of 30 kHz, whereas the envelope has a frequency of 50 Hz.
  • the inductances 35 of the auxiliary resonant circuit and 23 of the load circuit may be wound on a single ferromagnetic core.
  • This solution is shown schematically in Fig. 7, where the number 41 indicates a ferromagnetic core with three columns 43, 45 and 47.
  • the columns 43 and 47 have corresponding air gaps 43A and 47A.
  • the windings of inductances 35 and 23 respectively are wound on these columns.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Rectifiers (AREA)

Abstract

The electronic reactor for discharge lamps (L) comprises a bridge rectifier (5) connected to an alternating voltage source (3); a half-bridge with two controlled switching means (11, 13) made alternately conducting to connect the said lamp (L) and the said bridge rectifier (5); a resonant load circuit (17) connected to the said half-bridge (11, 13); and a smoothing capacitor (29) connected in parallel with the half-bridge (11, 13). An auxiliary resonant circuit (33) is provided to reduce the crest factor and correct the power factor between the output (19) of the half-bridge (11, 13) and the positive pole (5A) of the bridge rectifier (5).

Description

  • The invention relates to an electronic reactor or ballast for one or more discharge lamps of the type indicated in the introductory part of Claim 1.
  • A circuit of this type is described in IT-B-1208439. The electronic reactor generally has an input section consisting of a low-pass filter and a diode bridge, which has the function of rectifying the alternating mains voltage to supply it to a power oscillator in which the direct voltage is transformed into high-frequency alternating voltage and is then transferred to the resonant circuit comprising the lamp. The supply voltage across the terminals of the load circuit is a square-wave voltage at a high frequency, typically of the order of 25-30 kHz. It is supplied to a load circuit which typically has at least one discharge lamp with a capacitor in parallel and a stabilizing inductance in series. In the circuit described in IT-B-1208439, a capacitor is also provided, in series with the load circuit, enabling the power factor to be corrected.
  • In conventional circuits, the amplitude of the current and voltage across the lamp terminals fluctuate at low frequency, typically at twice the mains frequency. This phenomenon is known as "ripple". The extent of this fluctuation is characterized by what is known as a crest factor. The fluctuation of the maximum value of the current amplitude in the lamp is extremely harmful, since it curtails the mean service life of the lamp.
  • In conventional circuits, this fluctuation is partly limited by using a smoothing capacitor of suitable capacitance connected in parallel with the lamp supply half-bridge. However, for reasons of cost and overall size, this system cannot be used to obtain a reduction in the crest factor beyond a certain limit.
  • The object of the present invention is to propose an improvement to the common electrical reactor which enables the ripple phenomenon to be reduced drastically, if not completely eliminated.
  • Essentially, the invention provides an auxiliary series resonant circuit connected between the output of the lamp supply half-bridge and the bridge rectifier. This auxiliary resonant circuit stores and returns power with each switching cycle of the switch means of the load circuit supply half-bridge. The oscillation of the maximum current intensity in the load circuit is therefore reduced, and consequently the crest factor is reduced.
  • In practice, the auxiliary series resonant circuit is a circuit of the LC type, with one inductance and one capacitor, and is connected between the output of the half-bridge and the positive pole of the rectifier. To limit the overall size of the circuit, in a particularly advantageous embodiment the inductance of the auxiliary resonant circuit and the inductance of the load circuit may be wound on a common ferromagnetic core advantageously consisting (in a preferred embodiment) of a three- column core with two air gaps on the two outer columns on which the two windings are made.
  • The auxiliary resonant circuit also simultaneously corrects the power factor. By using the auxiliary resonant circuit it is possible to obtain, for the same value of the smoothing capacitor, a much smaller crest factor than in conventional reactors.
  • An electronic reactor with an inductance connected between the output of the lamp supply half-bridge and the bridge rectifier is known from US-A-5.001.400. However, this inductance does not form part of an oscillating circuit.
  • Further characteristics of the electronic reactor according to the invention are indicated in the attached claims.
  • The invention will be more clearly understood from the description and the attached drawing which shows a non-restrictive practical example of the invention. In the drawing,
    • Fig. 1 is a circuit diagram of the reactor;
    • Figs. 2 to 5 show successive phases of operation of the circuit shown in Fig. 1;
    • Figs. 6A - 6D show the variation of the current in the circuit in the four phases illustrated in Figs. 2 to 5;
    • Fig. 7 shows schematically the disposition of the windings on a single ferromagnetic core;
    • Fig. 8 is a graph of the lamp current as a function of time; and
    • Fig. 9 is a graph of the current in the auxiliary oscillator circuit.
  • With reference to Fig. 1 initially, the circuit has a filter 1, at whose input there is an alternating voltage supplied from a source indicated schematically by 3. The filter output is connected to a diode bridge rectifier indicated by 5. Two lines 7 and 9, positive and negative respectively, are connected to the positive pole 5A and the negative pole 5B of the bridge rectifier 5. The direct voltage supplied by the bridge rectifier 5 is transformed to alternating voltage at high frequency by two switches 11 and 13, suitably controlled by an electronic control circuit 15, of a type known in itself and not described in greater detail. The load supply voltage is obtained by alternate switching of the two switches 11 and 13. In the example illustrated, the load circuit, indicated as a whole by 17, is connected between the output 19 of the half-bridge formed by the switches 11 and 13 and the negative line 9, but could also be connected between the said output 19 and the positive line 7. The load circuit comprises a discharge lamp L in parallel with a capacitor 21. An inductance 23, consisting of a stabilizing coil, and a capacitor 20 are connected in series with the lamp L and the capacitor 21. The load circuit could also comprise two or more lamps with corresponding capacitors and inductances, in series and in parallel respectively.
  • Two diodes 25 and 27 are connected in parallel with the two switches 11 and 13 respectively of the supply half-bridge of the load circuit. A smoothing capacitor 29 is also connected in parallel with the half-bridge between the negative line 9 and the positive line 7 down-line from a diode 31.
  • An auxiliary series resonant circuit indicated in a general way by 33 and comprising an inductance 35 and a capacitor 37 is connected between the output 19 of the half-bridge formed by the switches 11 and 13 and the positive pole 5A of the bridge rectifier 5.
  • The four phases of each switching cycle of the circuit described above will now be described with reference to Figs. 2 to 5 and 6A to 6D. The load current variation shown in Figs. 6A - 6D is intended to relate to a cycle which is repeated with a frequency of 25-30 kHz, while the input voltage of the bridge 5 varies sinusoidally at the mains frequency (50 Hz).
  • In the first phase (illustrated in Figs. 2, 2A and 2B), the switch 13 is closed, while the switch 11 is open. The current ic in the auxiliary resonant circuit flows in the direction shown in Fig. 2 from the positive pole 5A of the bridge rectifier through the resonant circuit 33, the switch 13 and the line 9 to the negative pole 5B of the bridge rectifier 5. Since the circuit 33 is a resonant circuit, the current ic(t) on the load varies as shown in Fig. 6A. Figs. 2A and 2B show the equivalent circuits of the load current ic and the current iL in the resonant circuit. As shown in Fig. 2B, the load is across the line.
  • Before the current ic(t) is inverted, the switch 13 is opened and the circuit is in the state shown in Fig. 3, with both switches 11 and 13 open. The current iL is passed through the diode 25 across the capacitor 29, to which the load current ic is also passed. In this phase the smoothing capacitor 29 is charged and the current ic reaches zero as shown in the graph in Fig. 6B. In the equivalent circuits shown in Figs. 3A and 3B, the smoothing capacitor is represented by a source of direct voltage.
  • Before the current ic reaches zero, the switch 11 is closed, while the switch 13 remains open. The circuit enters the state shown in Fig. 4. In this phase, the residual power stored in the auxiliary resonant circuit 33 is exchanged between the reactive components 35 and 37 of the resonant circuit 33, producing the current iL which flows as shown in Fig. 4. The power previously stored in the smoothing capacitor 29 is also returned to the load in this phase, producing a current ic indicatedin Fig. 4, as shown in the equivalent circuit in Fig. 4B, in which the capacitor 29 is again represented by a direct voltage source. The variation of the current ic is shown in Fig. 6C.
  • The switch 11 is then opened again and the circuit enters the state shown in Fig. 5, in which the current iL flows through the diode 27 and charges the capacitor 29. The current ic varies as shown in Fig. 6D. At the end of this phase, the current again reaches zero, and when this value is reached the switch 13 is closed again to return the circuit to the initial state shown in Fig. 2.
  • As may be seen from an examination of the equivalent circuits in Figs. 5A and 5B, the power stored in the auxiliary resonant circuit 33 can be used (in the phase shown in fig. 5 with the switches 11 and 13 open) to reduce the crest factor and to bring the fluctuation of the load current to a minimum value.
  • In this state, while the load 17 is connected across the line, and the current ic is flowing in it (Fig. 5B), the current iL is flowing in the auxiliary resonant circuit 33 and charging the capacitor 29, represented by the voltage source in Fig. 5A. Thus the power is returned to the capacitor 29.
  • The use of the auxiliary resonant circuit results in a reduction of the crest factor in the current ic, as seen in Fig. 8, where the graph of the current ic as a function of time is shown. The letters (a) and (b) indicate the envelopes of the maxima and minima of the waveforms representing the high-frequency current across the load 17. The undulation of the curves a and b is greatly reduced by comparison with the conventional circuits in which the auxiliary series resonant circuit 33 is not provided. Conversely, Fig. 9 shows the variation of the current iL where (c) and (d) are the envelopes of the maxima and minima. The graph showing the variation of the current is drawn in an approximate form, since it should show a frequency of 30 kHz, whereas the envelope has a frequency of 50 Hz.
  • To reduce the overall size of the circuit, the inductances 35 of the auxiliary resonant circuit and 23 of the load circuit may be wound on a single ferromagnetic core. This solution is shown schematically in Fig. 7, where the number 41 indicates a ferromagnetic core with three columns 43, 45 and 47. The columns 43 and 47 have corresponding air gaps 43A and 47A. The windings of inductances 35 and 23 respectively are wound on these columns.
  • It is to be understood that the drawing shows only an example provided solely as a practical demonstration of the invention, and that this invention may be varied in its forms and dispositions without departure from the scope of the guiding concept of the invention. The presence of any reference numbers in the enclosed claims has the purpose of facilitating the reading of the claims with reference to the description and to the drawing, and does not limit the scope of protection represented by the claims.

Claims (6)

1. Electronic reactor, or ballast, for a discharge lamp (L), comprising:
- a bridge rectifier (5) connected to an alternating voltage source (3);
- a half-bridge with two controlled switching means (11, 13) made alternately conducting to connect the said lamp (L) and the said bridge rectifier (5);
- a resonant load circuit (17) connected to the said half-bridge (11, 13) and including the said lamp (L); and
- a smoothing capacitor (29) connected in parallel with the half-bridge (11, 13);

characterized in that an auxiliary resonant circuit (33) is connected between the output (19) of the half-bridge (11, 13) and the positive pole (5A) of the bridge rectifier (5).
2. Reactor according to Claim 1, characterized in that the said auxiliary resonant circuit (33) is a series resonant circuit with a capacitive component (37) and a inductive component (35).
3. Reactor according to Claim 1 or 2, characterized in that the load circuit (17) comprises one capacitor (21) in parallel with the said lamp (L) and one inductance (23) in series.
4. Reactor according to Claim 3, characterized in that the winding of the inductance (22) of the load circuit (17) and the winding of the inductance (35) of the auxiliary resonant circuit (33) are wound on a common ferromagnetic core (41 ).
5. Reactor according to Claim 4, characterized in that the said common ferromagnetic core (41) comprises three columns (43, 45, 47), two of which (43, 47) have corresponding air gaps (43A, 47A).
6. Reactor according to one or more of the preceding claims, characterized in that the load circuit (17) has two or more discharge lamps.
EP94830048A 1994-02-11 1994-02-11 Electronic reactor for the supply of discharge lamps with an oscillator circuit to limit the crest factor and to correct the power factor Revoked EP0667734B1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
DE69410775T DE69410775T2 (en) 1994-02-11 1994-02-11 Electronic ballast for discharge lamps with a resonant circuit to limit the form factor and to improve the power factor
ES94830048T ES2118355T3 (en) 1994-02-11 1994-02-11 ELECTRONIC REACTOR FOR THE SUPPLY OF DISCHARGE LAMPS WITH AN OSCILLATOR CIRCUIT TO LIMIT THE CREST FACTOR AND CORRECT THE POWER FACTOR.
AT94830048T ATE167019T1 (en) 1994-02-11 1994-02-11 ELECTRONIC BALLAST FOR DISCHARGE LAMPS WITH A RESONANCE CIRCUIT TO LIMIT THE FORM FACTOR AND IMPROVE THE POWER FACTOR
EP94830048A EP0667734B1 (en) 1994-02-11 1994-02-11 Electronic reactor for the supply of discharge lamps with an oscillator circuit to limit the crest factor and to correct the power factor
US08/386,810 US5485060A (en) 1994-02-11 1995-02-08 Electronic reactor for the supply of discharge lamps with an oscillator circuit to limit the crest factor and to correct the power factor
CA002142250A CA2142250A1 (en) 1994-02-11 1995-02-10 Electronic reactor for the supply of discharge lamps with an oscillator circuit to limit the crest factor and to correct the power factor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP94830048A EP0667734B1 (en) 1994-02-11 1994-02-11 Electronic reactor for the supply of discharge lamps with an oscillator circuit to limit the crest factor and to correct the power factor

Publications (2)

Publication Number Publication Date
EP0667734A1 true EP0667734A1 (en) 1995-08-16
EP0667734B1 EP0667734B1 (en) 1998-06-03

Family

ID=8218375

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94830048A Revoked EP0667734B1 (en) 1994-02-11 1994-02-11 Electronic reactor for the supply of discharge lamps with an oscillator circuit to limit the crest factor and to correct the power factor

Country Status (6)

Country Link
US (1) US5485060A (en)
EP (1) EP0667734B1 (en)
AT (1) ATE167019T1 (en)
CA (1) CA2142250A1 (en)
DE (1) DE69410775T2 (en)
ES (1) ES2118355T3 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0726696A3 (en) * 1995-02-10 1997-05-21 Gen Electric Power factor circuit
EP0847230A2 (en) * 1996-12-05 1998-06-10 Mitsubishi Denki Kabushiki Kaisha Inverter apparatus
EP0772281A3 (en) * 1995-10-31 1998-06-17 Sony Corporation Power-factor improvement converters
US5939837A (en) * 1997-07-15 1999-08-17 Magnetek, Inc. Electronic ballast circuit for independently increasing the power factor and decreasing the crest factor
WO1999067976A2 (en) * 1998-06-23 1999-12-29 Electro-Mag International, Inc. Ballast circuit
WO2000038480A1 (en) * 1998-12-18 2000-06-29 Electro-Mag International, Inc. Ballast having a reactive feedback circuit
WO2000067534A1 (en) * 1999-04-28 2000-11-09 Koninklijke Philips Electronics N.V. Circuit arrangement
WO2001033915A1 (en) * 1999-11-01 2001-05-10 Koninklijke Philips Electronics N.V. A high power factor electronic ballast with simplified circuit topology
WO2001065893A2 (en) * 2000-02-29 2001-09-07 Koninklijke Philips Electronics N.V. Electronic ballast
EP1638374A2 (en) * 2004-09-20 2006-03-22 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit arrangement for operating at least a light source with improved crest factor

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0752804B1 (en) * 1995-07-05 1999-12-01 MAGNETEK S.p.A. Supply circuit for discharge lamps with means for preheating the electrodes
EP0889675A1 (en) * 1997-07-02 1999-01-07 MAGNETEK S.p.A. Electronic ballast with lamp tyre recognition
GB0516738D0 (en) * 2005-08-16 2005-09-21 Trw Ltd Motor drive circuit
CN102413622A (en) * 2011-07-27 2012-04-11 台达电子企业管理（上海）有限公司 Lighting device, electronic ballast therein and protection method of electronic ballast

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2527889A1 (en) * 1982-06-01 1983-12-02 Control Logic Pty Ltd METHOD AND APPARATUS FOR REDUCING HARMONICS IN BALLASTS OF DISCHARGE LAMP IN GAS
EP0372303A1 (en) * 1988-12-07 1990-06-13 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit arrangement for operating a low-pressure discharge lamp
US4985664A (en) * 1989-10-12 1991-01-15 Nilssen Ole K Electronic ballast with high power factor
US5001400A (en) * 1989-10-12 1991-03-19 Nilssen Ole K Power factor correction in electronic ballasts
EP0488478A2 (en) * 1990-11-27 1992-06-03 Matsushita Electric Works, Ltd. Inverter device
EP0534727A1 (en) * 1991-09-26 1993-03-31 General Electric Company Electronic ballast arrangement for a compact fluorescent lamp
EP0541909A1 (en) * 1991-11-12 1993-05-19 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Discharge lamp driving circuit

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4939429A (en) * 1989-08-24 1990-07-03 Rca Licensing Corporation High voltage regulator circuit for picture tube
US5172309A (en) * 1991-08-07 1992-12-15 General Electric Company Auxiliary quasi-resonant dc link converter

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2527889A1 (en) * 1982-06-01 1983-12-02 Control Logic Pty Ltd METHOD AND APPARATUS FOR REDUCING HARMONICS IN BALLASTS OF DISCHARGE LAMP IN GAS
EP0372303A1 (en) * 1988-12-07 1990-06-13 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit arrangement for operating a low-pressure discharge lamp
US4985664A (en) * 1989-10-12 1991-01-15 Nilssen Ole K Electronic ballast with high power factor
US5001400A (en) * 1989-10-12 1991-03-19 Nilssen Ole K Power factor correction in electronic ballasts
EP0488478A2 (en) * 1990-11-27 1992-06-03 Matsushita Electric Works, Ltd. Inverter device
EP0534727A1 (en) * 1991-09-26 1993-03-31 General Electric Company Electronic ballast arrangement for a compact fluorescent lamp
EP0541909A1 (en) * 1991-11-12 1993-05-19 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Discharge lamp driving circuit

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0726696A3 (en) * 1995-02-10 1997-05-21 Gen Electric Power factor circuit
EP0772281A3 (en) * 1995-10-31 1998-06-17 Sony Corporation Power-factor improvement converters
US5835368A (en) * 1995-10-31 1998-11-10 Sony Corporation Power-factor improvement converter
US5973946A (en) * 1995-10-31 1999-10-26 Sony Corporation Power-factor improvement converter
EP0847230A2 (en) * 1996-12-05 1998-06-10 Mitsubishi Denki Kabushiki Kaisha Inverter apparatus
EP0847230A3 (en) * 1996-12-05 1999-11-17 Mitsubishi Denki Kabushiki Kaisha Inverter apparatus
US5939837A (en) * 1997-07-15 1999-08-17 Magnetek, Inc. Electronic ballast circuit for independently increasing the power factor and decreasing the crest factor
WO1999067976A3 (en) * 1998-06-23 2000-04-27 Electro Mag Int Inc Ballast circuit
WO1999067976A2 (en) * 1998-06-23 1999-12-29 Electro-Mag International, Inc. Ballast circuit
WO2000038480A1 (en) * 1998-12-18 2000-06-29 Electro-Mag International, Inc. Ballast having a reactive feedback circuit
WO2000067534A1 (en) * 1999-04-28 2000-11-09 Koninklijke Philips Electronics N.V. Circuit arrangement
WO2001033915A1 (en) * 1999-11-01 2001-05-10 Koninklijke Philips Electronics N.V. A high power factor electronic ballast with simplified circuit topology
WO2001065893A2 (en) * 2000-02-29 2001-09-07 Koninklijke Philips Electronics N.V. Electronic ballast
WO2001065893A3 (en) * 2000-02-29 2001-12-20 Koninkl Philips Electronics Nv Electronic ballast
EP1638374A2 (en) * 2004-09-20 2006-03-22 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit arrangement for operating at least a light source with improved crest factor
EP1638374A3 (en) * 2004-09-20 2006-03-29 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Circuit arrangement for operating at least a light source with improved crest factor
US7154227B2 (en) 2004-09-20 2006-12-26 Patent-Treuhand-Gesellschaft Fur Elektrisch Gluhlampen Mbh Circuit arrangement for operating at least one light source
CN1753595B (en) * 2004-09-20 2010-09-29 电灯专利信托有限公司 Circuit arrangement for operating at least one light source

Also Published As

Publication number Publication date
EP0667734B1 (en) 1998-06-03
ES2118355T3 (en) 1998-09-16
US5485060A (en) 1996-01-16
CA2142250A1 (en) 1995-08-12
DE69410775T2 (en) 1998-12-03
DE69410775D1 (en) 1998-07-09
ATE167019T1 (en) 1998-06-15

Similar Documents

Publication Publication Date Title
US4782268A (en) Low-pressure discharge lamp, particularly fluorescent lamp high-frequency operating circuit with low-power network interference
US4808887A (en) Low-pressure discharge lamp, particularly fluorescent lamp high-frequency operating system with low inductance power network circuit
US6429604B2 (en) Power feedback power factor correction scheme for multiple lamp operation
US5485060A (en) Electronic reactor for the supply of discharge lamps with an oscillator circuit to limit the crest factor and to correct the power factor
JPH0275200A (en) Electron stabilizer
US6337800B1 (en) Electronic ballast with inductive power feedback
US5345164A (en) Power factor corrected DC power supply
EP0598271B1 (en) High-frequency power unit for neon tubes
CA1290817C (en) Power supply apparatus
KR100262479B1 (en) Dc converter
AU619970B2 (en) Ballast circuits for discharge lamps
KR100636469B1 (en) Discharge Lamp Operating Apparatus
EP0824300B1 (en) Inverter for the power supply of discharge lamps with means for improving the power factor
JPH0678537A (en) Switching power supply equipment
JP2972785B2 (en) Discharge lamp lighting device
JP3539464B2 (en) Power supply and discharge lamp lighting device
SU993413A1 (en) Static dc voltage to ac voltage converter
JP3177240B2 (en) Power supply circuit
JPH07142179A (en) Discharge lamp lighting device
JPH06197556A (en) Power conversion device
JPH07274535A (en) Power system, discharge lamp lighting device, and lighting system
JPH0614553A (en) Power converter
JPH08182327A (en) Switching power source circuit
JPH10270184A (en) Discharge lamp lighting device
JPS5926110B2 (en) Oscillating booster circuit that extracts sine waves

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19941125

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB IT LI LU NL SE

17Q First examination report despatched

Effective date: 19961119

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE DK ES FR GB IT LI LU NL SE

REF Corresponds to:

Ref document number: 167019

Country of ref document: AT

Date of ref document: 19980615

Kind code of ref document: T

REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: BOVARD AG PATENTANWAELTE

Ref country code: CH

Ref legal event code: EP

REF Corresponds to:

Ref document number: 69410775

Country of ref document: DE

Date of ref document: 19980709

ITF It: translation for a ep patent filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19980903

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2118355

Country of ref document: ES

Kind code of ref document: T3

ET Fr: translation filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19990204

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19990210

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19990211

Year of fee payment: 6

Ref country code: CH

Payment date: 19990211

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 19990216

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19990226

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19990228

Year of fee payment: 6

PLBI Opposition filed

Free format text: ORIGINAL CODE: 0009260

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 19990316

Year of fee payment: 6

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: LU

Payment date: 19990406

Year of fee payment: 6

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19990421

Year of fee payment: 6

26 Opposition filed

Opponent name: OSRAM GMBH

Effective date: 19990303

NLR1 Nl: opposition has been filed with the epo

Opponent name: OSRAM GMBH

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

PLBF Reply of patent proprietor to notice(s) of opposition

Free format text: ORIGINAL CODE: EPIDOS OBSO

RDAH Patent revoked

Free format text: ORIGINAL CODE: EPIDOS REVO

RDAG Patent revoked

Free format text: ORIGINAL CODE: 0009271

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: PATENT REVOKED

27W Patent revoked

Effective date: 20000203

GBPR Gb: patent revoked under art. 102 of the ep convention designating the uk as contracting state

Free format text: 20000203

NLR2 Nl: decision of opposition
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL